.changeColor{background-color:#255ec8;animation-name:example;animation-duration:.5s;color:#fbffdf}.changeColor2{background-color:#fbffdf;height:25rem}.changeColor2:hover{background-color:#fffec1;box-shadow:-5px 10px #888}.dnaCenter{display:block;margin-left:auto;margin-right:auto}@keyframes example{0%{background-color:#cdffd8}to{background-color:#94b9ff}}.card-header{font-weight:700}